<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    #drag,
    #drag2 {
      width: 50px;
      height: 50px;
      background-color: orange;
      cursor: move;
    }

    #drag2 {
      background-color: red;
    }
  </style>
</head>

<body>
  <div id="drag"></div>
  <div id="drag2"></div>

  <script src="./drag.js"></script>
  <script>
    new Drag('drag');
    new Drag('drag2');
  </script>
</body>

</html>